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Statistical analysis of environmental parameters on the occurrences of tropical cyclones and earthquakes: an example from West North Pacific region

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Abstract

The nature of earthquake events and atmospheric factors’ response to the tropical cyclones (TCs) frequency during the boreal summer (June–July–August: JJA) season in the West North Pacific (WNP) is investigated using a 45-year (1977–2021) monthly dataset. The WNP is the most cyclonically active basin on the globe and boreal summer alone accounts for its 42% of share. The WNP region encompasses the subduction zones between the Pacific and Philippine Sea plates, where 32% of boreal summer TCs cross these plates’ boundaries. Here I conduct statistical and GIS analyses of many environmental parameters on the occurrence of TCs in the WNP and seismicity along the plates’ boundaries. Years with frequent TCs in the WNP correlate with statistically significantly high seismicity in the lithosphere, assuming a 75 km (correl: 0.75) and a 120 km (correl: 0.75) lithospheres, respectively. TCs do not need to cross the plates’ boundaries to increase the seismicity (correl: 0.47 and 0.43 for 75 km and 120 km lithosphere, respectively), possibly due to the large spatial areas affected by each TC. Among the environmental parameters investigated, relative vorticity is strongly linked with TC frequency in the WNP in boreal summer showing a maximum percentage of variation during both extremely high and low TC years. Higher-level tropospheric winds (200 hPa) and vertical shear are found more dominant in extremely high-TC years while middle level tropospheric winds (850 hPa) and vertical velocity (omega) are found more commanding in extremely low-TC years. Other factors like sea surface temperature, relative humidity, outgoing longwave radiation, sea level pressure, etc. are also found mutually connected through the environmental and dynamical processes and as a result influence cyclogenesis. Results from this work suggest that few environmental parameters may dominantly control the extreme cyclogenesis, which then influences seismicity along submerged plates’ boundaries. Having the earthquakes and TCs as two major destruction casing natural hazards in the region, the presented results are very valuable.

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Data availability

All data used in the current study are freely available and accessible through the links https://www.ncei.noaa.gov/products/international-best-track-archive?name=ib-v4-access, https://earthquake.usgs.gov/earthquakes/search/, and https://psl.noaa.gov.

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Acknowledgements

Author thanks the two anonymous reviewers for their constructive comments and for showing the direction for its future scope. The author thanks all the data providers. The author thanks to the U. S. Geological Survey (USGS) for providing all used earthquake data in this study. The author thanks the National Oceanic and Atmospheric Administration (NOAA) and the Regional Specialized Meteorological Center (RSMC) of the Japan Meteorological Agency (JMA) for providing TC data through the International Best Track Archive for Climate Stewardship (IBTrACS). The author thanks the National Centers for Environment Prediction (NCEP)–National Centers for Atmospheric Research (NCAR) and the Physical Sciences Laboratory (PSL) of the NOAA for providing all atmospheric and oceanic data used in the present study.

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Conceptualization: RSP. Methodology: RSP. Formal analysis and investigation: RSP. Writing—original draft preparation: RSP. Writing—review and editing: RSP. Funding acquisition: RSP. Resources: RSP.

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Correspondence to Ravi Shankar Pandey.

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Pandey, R.S. Statistical analysis of environmental parameters on the occurrences of tropical cyclones and earthquakes: an example from West North Pacific region. Mar Geophys Res 43, 44 (2022). https://doi.org/10.1007/s11001-022-09505-w

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